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GABAB receptor cell-surface export is controlled by an endoplasmic reticulum gatekeeper

Endoplasmic reticulum (ER) release and cell-surface export of many G protein-coupled receptors (GPCRs) are tightly regulated. For gamma-aminobutyric acid (GABA) B receptors of GABA, the major mammalian inhibitory neurotransmitter, the ligand-binding GB1 subunit is maintained in the ER by unknown mec...

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Published in:Molecular psychiatry 2016-04, Vol.21 (4), p.480-490
Main Authors: Doly, S, Shirvani, H, Gäta, G, Meye, F J, Emerit, M-B, Enslen, H, Achour, L, Pardo-Lopez, L, Yang, S-K, Armand, V, Gardette, R, Giros, B, Gassmann, M, Bettler, B, Mameli, M, Darmon, M, Marullo, S
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cited_by cdi_FETCH-LOGICAL-c3522-ccaa574b185b10c4a0647af3af1cdd5e100e2ac8d78f8ff933d26d723d817623
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container_title Molecular psychiatry
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creator Doly, S
Shirvani, H
Gäta, G
Meye, F J
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Gardette, R
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description Endoplasmic reticulum (ER) release and cell-surface export of many G protein-coupled receptors (GPCRs) are tightly regulated. For gamma-aminobutyric acid (GABA) B receptors of GABA, the major mammalian inhibitory neurotransmitter, the ligand-binding GB1 subunit is maintained in the ER by unknown mechanisms in the absence of hetero-dimerization with the GB2 subunit. We report that GB1 retention is regulated by a specific gatekeeper, PRAF2. This ER resident transmembrane protein binds to GB1, preventing its progression in the biosynthetic pathway. GB1 release occurs upon competitive displacement from PRAF2 by GB2. PRAF2 concentration, relative to that of GB1 and GB2, tightly controls cell-surface receptor density and controls GABA B function in neurons. Experimental perturbation of PRAF2 levels in vivo caused marked hyperactivity disorders in mice. These data reveal an unanticipated major impact of specific ER gatekeepers on GPCR function and identify PRAF2 as a new molecular target with therapeutic potential for psychiatric and neurological diseases involving GABA B function.
doi_str_mv 10.1038/mp.2015.72
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subjects 13/109
13/31
13/51
13/89
13/95
14/19
38/35
631/80
64/60
9/74
Amino Acid Sequence
Animals
Behavioral Sciences
Biochemistry, Molecular Biology
Biological Psychology
Carrier Proteins - metabolism
Cell Line
Cell Membrane - metabolism
Cell surface
Dimerization
Endoplasmic reticulum
Endoplasmic Reticulum - metabolism
G protein-coupled receptors
gamma-Aminobutyric Acid - metabolism
HEK293 Cells
Humans
Hyperactivity
Life Sciences
Medicine
Medicine & Public Health
Membrane Proteins - metabolism
Mice
Mice, Knockout
Neurological diseases
Neurosciences
Neurotransmitters
original-article
Pharmacotherapy
Protein Multimerization
Protein Subunits
Protein transport
Proteins
Psychiatry
Receptor density
Receptors, GABA-B - metabolism
Retention
γ-Aminobutyric acid
γ-Aminobutyric acid B receptors
title GABAB receptor cell-surface export is controlled by an endoplasmic reticulum gatekeeper
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